I was trying to extract the graph for relay obtained network (tflite) using autotvm.task.extract_from_graph(), will that work? Is tuning using auto-tuner possible for a tflite model with relay till now?
I have not tested that particular use case, but if you can get a relay program from tflite then it should work. The extract_from_program for relay tracks calls into topi, so it should be generic for this use case as well.
You can also look at this PR to see some examples of how to use extract_from_relay_program.